Air compressor



Feb. 8, 1927.

P. K'. WOOD AIR COMPRESSOR Filed June 6, 1925 2 sheetssheet 1 Feb. s, 1927. 1,616,733

1= .A K. woon AIR COMVRESSOR 1 Filed June 6. 1925 2 Sheets-Sheet 2 /wywlvrz PK- Woolf;

Patented Feb. 8, 1927.

PRESTON' K. Y W001D, 0F LOS ANGELES, CALIFORNIA.

AIR COMPRESSOR.

Application .mea :une e, 192m serial no. v35,405'.

This invention relates to pumps and more 'especially to rotary air pumps or compressors..

An object is to provide a water cooled ro tor and casing in a rotary compressor. An-

other object is to provide a rotor having side heads forming rotating sides of a piston chamber, and to provide a rotor having independent pistons positively reciprocated. An object is to provide a piston having actuating means and having a yieldingly f thrust packer so arranged as to have but small area exposed to iuid pressure reaction.

'15 An object is to' provide anadjustable gib for take up of wear by the rotor.

Another object is toprovide ample lubrication. I v

'And an object is to provide annular packing glands and packing for .the side heads.

Other objects and advantages will be made manifest in the following specification of van embodiment of the invention; variations, modifications and adaptations being deemed F within the scope and spirit of the invention as itis here claimed.

Figure 1 is an axial'section of the compressor.

Figure 2 is an elevation and partial section.

Figure 3 is a vplan of a piston; broken away.' Y 0 l Figure 4is a'detallof the extended piston.

The form illustrated of the compressor includes a rotor having a pair of positively controlled, radially opposed piston blades with yielding means for maintaining a close fit in a cylinder having inner heads running with the rotor, and-which cylinder has outer stationary wells. .Means are also included to4 vautomatically circulate a cooling fluid through the shell and the rotor.

Means for lubricating the rotor piston blades and also the rotor heads are provided.-

Further a simple and eiective form of annular packing for the running heads is I provided.

As here shown in Figure 1, a driving shaft 2 is screwed at 3 into'one side head or disc 4 which is securely bolted at 5 to a hollow cylindrical rotor 6 having closed sides 7.

On the opposite end of the rotor 6 is bolted a disc head 8 into the outer hub 9 of which is screwed a trunnion 10. The main shaft section 2 runs in a bushing 12 in bearing 13 Aextending' from the cas-` ing end wall 14.- which is bolted at 15 to a. circular flange 16 of a cylinder 17 having an opposite similar flange 18 bolted to an end Wall19. y

The shaft 2--10 is coaxial with the disc heads 4 8 and the walls 14--19 but th cylinder 17 Vis eccentric to the shaft.

This eccentricity forms a crescent air chamber 2O in which sweep the unconnected piston blades'.

The rotor is disposed lin close tangency to the top of the cylinderwherein is mortised a take-up gib 21 which may be forced. in from time to time by a screw 22.

On one side of the cylinder is an inlet port v 23 and opposite is the exhaust port 24, Fig. 2.

The heads 4 8 overlap the rim of the cylinder space 20 and form rotating sides thereof and the bottom ofthe. cylinder has an oil duct 25 leading to the near disc heads.

Just beyond the perimeters of the heads 4-8 there is formed in the 'flanges and walls, annular run-ways 26-27. In the runways 27 aresegments of annuli 30 which are mounted on pins 31 in the outer endsl of horns 32 whichl sweep in run-ways 26 and lie in diametrical slots 33 in the inside faces of the disc heads 4-'8. The horns which project on one side of the axis of the rotor (which is made a duplicate of semi-cylinders) form a pair to which are secured, rigidly, spaced piston plates 34 which extend laterally into the slots 33 and project out beyond the rotor and nearly engage the concave face of the cylinder 17.

Between the outer portions of each piston is slidable a presser block 35, the outer, transverse edge of which is longitudinally vconcaved to fit and receivea half-round packing 95 bar 36, which thrusts out against the face of the cylinder.

Between the inner spaced ends of' the plates 34 of each piston is secured a bolster 37 and against this rests a set of springs 38 extending into pockets 39 in the block 35 so that the block is yieldingly pressed out against the cylinder face. It will be -ob served that the exposed area of the pistons takes the reaction pressure of the compressed air but that reciprocation of the pistons is made positive by the coaction of the runners 30 in the eccentric grooves 27. Therefore,

vonly a very lsmall area of the pressure blocks 35 exposed to pressure as these work in and out during the rotation of the rotor. Intheir nearest approach the pistons leave va space 40, Fig. 2, and into this fiows alubrica-nt admitted through a hole 41 in bearing 13, thenceto a duct 42 in shaft 2 and an aperture 43 in head 4. Lubricant also flows-into 'space 440 through aperturel 44 in head 8 and to a duct 45 in the trunnion l10; the outer end of which is covered by a cap 46 which mav be provided with a grease through ducts 68 atv a point nearer the center than through oil duct 25.

` To further prevent pressure losses each d isc head -has'a lateralring 48 of packinof which chamber'so that centrifugal forcewill main- It will be seen that.rotating heads (of disc wheel form) run snugly against the near end faces-of the cylinder 17 and are packed by al film of lubricant from duct 25.

is engaged by a gland band 49 sunk in its respectivey head 14 or 19, and adjusted inwardly by screws 50.

I provide for water coolin of both case and rotor. This is accomplished by recessing end walls 14-19 at 52 for an area nearly vequal vto itsl head 4 or'8.v Casing wall 19 has an inlet port 53 and wall 14 vhas an' outlet port 54 near the outer portion of recess 52. The rotor head 8 has, near its center, inlet ports 55 and head 4 has outlet ports 56 leading from the outer portion of the rotor tain constant iow in 'and out of the recess 52 land through the rotor. But to enhance this flow I provide centrifugal pumping vanes 58 `on lthe head 4 to -run in the recess 52 of wall 14.

Leading away from the gib-21,re1ief ports 66 are cut i'n the cylinder wall tothe inlet and outlet ports 23-24 to eliminate dead pockets between the air ports. Y

It will be seen that since the heads 4 8 run with the rotor, only the standing cylinder offers surface resista-nce to the volume of 'air swept through.

' What is claimed is:

1. A rotary air compressor havin a cas- I ing forming a fixed cylindrical cham er havbeing connected to-the segments so as to be reciprocated thereby...

. ing side walls recessedto form concentric .55

runways, segmental runners in the runways, a rotor mounted -eccentrically in the chamber and having side heads forming running' Walls and'overlapping the stationary ends of t the cylinder, and independent pistons mounted for radial movement in thev rotor and 2. A rotary air compressor having a caisin forming a cylindrical chamber having sigo walls recessed to form eccentric runways, segmental runners in the runways, a

rotor mounted eccentrically in the chamber and having side `heads forming ruiming walls of the cylinder, and independent pistons mounted for radial movement in the rotor and being connected to the segments so as to be reciprocated thereb ,and each piston having ayieldable p'ac ing means thrust against lthe cylinder face, said packing means includinc a packing bar and a yieldable block in the outer end of which Said bar is rollably mounted and has a marginal surface subject to effective pressure on the compression side of the piston.l 7

3. A rotary air compressor having a fixed cylindrical air chamber, inner rotary side heads over-lapping. the sides of the fixed chamber and eccentric thereto, a rotor eccentric to the chamber axis and concentric with the'side heads and attached thereto, runners in runways in the casing of the chamber, and pistons connected to the runners to be reciprocated thereby and annular packing actingon the sides of the side heads.

4. A rotary air compressor having a cylindrical air chamber, inner rot-ary side'heads over-lapping the sides of the chamber and eccentric thereto, a rotor eccentric to the chamber axis `and concentric with the side heads and attached thereto, runners in runways in the` casing of the chamberand pistons connected to the runners to be reciprocated thereby and Asliding `radially in the side heads and in the rotor.

5. A rotary air compressor having a cylindrical air chamber, inner rotary side heads over-lapping the sides of the chamber and eccentric thereto, a rotor eccentric .to the chamber axis and concentric with the side heads and attached thereto, runners in runasv cated thereby; the cylinder casing having` outer fixed side walls; the rotor body being hollow, and means for providing for cooling-water circulation through the casing and the rotor cavity.

6. A rotary pump comprising a .casing having side walls with recessed inner faces, a shaft device supported in the walls and carrying a rotor which has a diametrical slot from side to side, a cylindrical chamber section secured between the walls and eccentric to the rotor and in tangential contact therewith, end heads connected to the rotor, and pistons sliding in the rotor slot and opera- .tivcly connected to' the fixed cylinder to run in a circle about 'the shaft.

7. A rotary pump comprising a casing having side walls with grooved inner faces,

liu

packing in the grooves a shaft device supfixed cylindrical chamber section secured between the walls and eccentric tothe rotor and in tangential lcontact therewith; and

ported in-the walls an carrying a rotor, a.

vhavin a sha device, supported in the walls, carrying a rotor, a cylindrical chamber section secured between ,the Walls and eccentric to the rotor and in tangential contact therewith; said rotor being hollow and having yflow communications withl the reces es of the walls for liquid circulation, and istons slidingin the rotor and operatively connected to the fixed cylinder to run in a circle about the shaft, and pumping vanes carried, by the rotor to force cooling circulation in the recesses.

9. A rotary air compressor having a rotor with disc heads onts sides, a casing form-l ing an eccentric chamber, side wallshaving annular ring-glands sunk therein, and packing bands on the heads and opposed to ythe glands.

land packing bands on the heads and opposed l to the glands; thebands extending into re-l cesses in the side walls. l

11. A` rotary air compressor having a cylinder, rotary side hea s overlapping the" cylinder ends and being eccentric thereto,

concentric runways around the cylinder ends, casing end walls having annular refixed between the heads and tangent to the cylinder, and'pistons; working in the rotor ,and extending, into the ,head grooves and having runners in the-runways. a

12. An air Vcompressor having a rotor with Y,

45' eccentric fluid chamber, side walls fixed to disc 'heads on its sides, a casing forming an the casing and coveringthe disc heads, and

annular 'packing meansfbetween the side,

walls and the vsides of thel heads. y

13. A- pump having 'an outercylinder, an inner, cylindrical, lpiston carrier ofl equal width with the outer -cylinder and tangent thereto, side heads fixed to the inner carrier and overlapping the ends of the outer cylinder, respective supportingl means for the cylinderand the carrier and providing for relative rotation, and yindependent pistons mounted for reciprocation in thecarrier and movably connected to the outer cylinder.

14. In a pump, an outer member having a cylindrical bore fluid chamber, a radially disposed piston device, and a cylindrical carrier in and `tangent to the chamber and in which the piston device is radially movable; said device being connected tothe chamber for circular orbital movement and having a packing means yieldingly thrust "against the bore face.`

PRESTON WQOD. l a 

